[Kernel] [UC] Rename delta-unity to delta-kernel-unitycatalog and move folder to kernel/unitycatalog (delta-io#5532)

## 🥞 Stacked PR
Use this [link](https://github.com/delta-io/delta/pull/5532/files) to
review incremental changes.
-
[**stack/delta_kernel_unitycatalog**](delta-io#5532)
[[Files changed](https://github.com/delta-io/delta/pull/5532/files)]

---------
#### Which Delta project/connector is this regarding?

- [ ] Spark
- [ ] Standalone
- [ ] Flink
- [X] Kernel
- [ ] Other (fill in here)

## Description

Title. Rename sbt project; move folder.

## How was this patch tested?

Just a rename/move. Existing CI and UTs.

## Does this PR introduce _any_ user-facing changes?

No.

Author: scottsand-db

build.sbt

@@ -906,12 +906,12 @@ lazy val kernelBenchmarks = (project in file("kernel/kernel-benchmarks"))
     ),
   )
 
-lazy val unity = (project in file("unity"))
+lazy val kernelUnityCatalog = (project in file("kernel/unitycatalog"))
   .enablePlugins(ScalafmtPlugin)
   .dependsOn(kernelDefaults % "test->test")
   .dependsOn(storage)
   .settings (
-    name := "delta-unity",
+    name := "delta-kernel-unitycatalog",
     commonSettings,
     javaOnlyReleaseSettings,
     javafmtCheckSettings,